> dave wrote: > <SNIP> > The boards are positive photo from Maplins > <SNIP> Well in that case def. do not use lye. Maplins might recomend it on the web page, but the manufacturer recomends sodium silicate on the package of the pre sensitized boards. Sodium silicate is a lot more fogriving. With lye if you have the temp. too high the entire thing will just strip instantly. If you under exposed positive resist then EVERY thing should have stayed on. As everyone has said 15s is probably too short. Too short an exposure with positive and you will get a completly covered board.
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Re: photo layer coming off
2013-05-13 by cunningfellow